<!DOCTYPE HTML>
<html>
  <body>

    <!-- Default values for open, close, separators -->
    <math>
      <mfenced open="(" close=")" separators=",">
        <mi>a</mi> 
        <mi>b</mi> 
        <mi>c</mi> 
        <mi>d</mi> 
        <mi>e</mi>  
      </mfenced>
    </math>
    
 </body>
</html>
